A good friend built the sled. after we looked at all of the ways this was the most accurate and repeatable method we could come up with.

We looked at smooth surfaces and they weren't repeatable.

Next we looked at weights and found that they were not accurate because the rifle had to overcome
the inertia of the weights before it could move and different recoil values could not be predicted.

By using the different springs with a spring rate chart for each combination we could calculate the recoil using standard charts and the device would almost exactly duplicate the numbers. In fact
It reads almost one pound greater than calculated so our numbers are slightly conservative.

It is also extremely repeatable (Very important for comparing results).

The device/sled only has a couple of pounds applied in battery, so the rifle is aloud to start moving instantly .

The name (Recoil Master 3000)started out as a joke but it stuck.

Each time we started a test we first tested a 30/06 with no brake and the same ammo as always
to make sure we had consistent results.

My friend Carl designed and built it, and I give him full credit for a very good test bed.